Portable fan



FIG. 1 is a front elevational view of a portable fan showing our newdesign;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and

FIG. 5 is a side elevational view thereof, the opposite side beingsubstantially a mirror image of that shown.

The ornamental design for a portable fan as shown and described.